Show me in the U.S. Constitution where it says that the president is not allowed to make an appointment to the U.S. Supreme Court before an election. Obama made an appointment in 2016 and the Senate rejected the appointment. If the Democrats controlled the Senate they would reject Trump's appointment. Also, if the Democrats controlled both the presidency and the Senate they would do exactly what Trump and the Republicans are doing right now. The statement you made that Trump has said that he will not accept the results of the election is a lie. He said that he needs to see exactly what happens in the election before saying one way or the other. If it is proven that there was fraud or that elections in some states are closely contested and recounts are needed, why would he want to concede until those issues are resolved?